Author: Martin N. GibbinsPublisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 138
Book Description
Environmental Exposure Effects on Composite Materials for Commercial Aircraft
Author: Martin N. GibbinsPublisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 138
Book Description
Environmental Exposure Effects on Composite Materials for Commercial Aircraft
Author: Environmental Exposure Effects on Composite Materials for Commercial Aircraft
Author: Randy L. CoggeshallPublisher:
ISBN:
Category : Composite materials
Languages : en
Pages :
Book Description
Environmental Effects on Composites for Aircraft
Author: Richard Alan PridePublisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 28
Book Description
Environmental Effects on Composites for Aircraft
Author: Richard A. PridePublisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 28
Book Description
Environmental Exposure Effects on Composite Materials for Commerical Aircraft
Author: Environmental Exposure Effects on Composite Materials for Commercial Aircraft
Author: Flight Service Environmental Effects on Composite Materials and Structures
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 14
Book Description
NASA Langley and the U.S. Army have jointly sponsored programs to assess the effects of realistic flight environments and ground-based exposure on advanced composite materials and structures. Composite secondary structural components were initially installed on commercial transport aircraft in 1973; secondary and primary structural components were installed on commercial helicopters in 1979; and primary structural components were installed on commercial aircraft in the mid-to-late 1980's. Over 5.3 million total component flight hours have been accumulated on 350 composite components since 1973. Service performance, maintenance characteristics, and residual strength of numerous composite components are reported. In addition to data on flight components; 10-year ground-based exposure test results on material coupons are reported. Comparisons between flight and ground-based environmental effects for several composite material systems are also presented. Test results indicate excellent in-service performance with the. composite components during the 15 year evaluation period. Good correlation between ground-based material performance and operational structural performance has been achieved.
Long-term Environmental Effects and Flight Service Evaluation of Composite Materials
Author: Howard Benson DexterPublisher:
ISBN:
Category : Aerospace industries
Languages : en
Pages : 192
Book Description
Environmental Effects on a Protective Coating Used to Mitigate Composite Degradation
Author: Nelson Ndukwe AkwariPublisher:
ISBN:
Category :
Languages : en
Pages : 126
Book Description
Composite materials are widely used in various applications and industries around the world. In recent years, commercial airplane companies have used composite materials for critical load bearing structures such as fuselage sections. During the lifetime utilization of composite materials, they can be subjected to extreme environmental conditions such as ultraviolet light, temperature fluctuations, humidity, and moisture. Depending on the amount of exposure to a composite material, the environmental conditions can negatively affect the chemical and mechanical properties of the fibers and matrix. Companies are investing substantial amounts of money and time to prevent composite materials from deteriorating by protecting them with protective materials such as coverings or coatings specifically designed to mitigate any damage to the underlying composite material. This project focused on the effect of environmental conditions on a thermoset composite material and the evaluation of protective coatings to mitigate ultraviolet (UV) degradation of an underlying carbon fiber reinforced polymer (CFRP) composite substrate. Standardized laboratory test methods were used to replicate aerospace production in-service environments commonly seen in commercial aerospace factories. Additional considerations were given to the manufacturing processes and transport of composite parts. Tests and evaluations focused on the durability of the protective coating to environmental effects such as moisture, heat, and ultraviolet radiation. In order to evaluate the effectiveness of the coating to prevent degradation to the underlying composite substrate, mechanical and analytical evaluations of the coated composite substrate were performed. The composite substrate used throughout testing contained a co cured surfacing film with an epoxy polymer matrix chemistry. Consideration was given to the effects of environmental exposure on the surfacing film and potential subsequent effects on the composite structure as a whole. A goal of the project was to down select a non-chromate protective coating that could effectively protect the underlying composite material from UV degradation. A second goal of this project was to quantify the UV and Condensing Humidity (moisture) degradation mechanisms and kinetics of the protective coating. A kinetic model was utilized to evaluate theindependent degradation mechanisms due to UV exposure and Condensing Humidity (moisture) respectively. These independent mechanisms were evaluated for synergistic effects and compared to Outdoor exposure of protective coated composite panels with the goal of trying to determine if a cumulative model can be used to predict the overall degradation kinetics. One commercial off-the-shelf non chromate epoxy-based coating was down selected after the completion of screening tests and proved to successfully protect the underlying composite material throughout a wide range of extreme environmental conditions. The independent evaluation of the degradation mechanisms due to UV exposure and Condensing Humidity (moisture) yielded results which correlated to industry and literature results. This research was unable to accurately develop a cumulative model that could consistently predict the overall degradation kinetics of a protective coated composite panel subjected to outdoor exposure conditions.